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Spatial Extent of Data

USGS Data Source

USGS Thesaurus Keywords

groundwater model, national hydrologic grid, water use, national grid, modflow, groundwater availability, national hydrogeologic framework, national hydrogeologic database, usgsgroundwatermodel

Place Keywords

Conterminous U.S.

National-Scale Grid to Support Regional Groundwater Availability Studies and a National Hydrogeologic Database

The National Hydrogeologic Grid (NHG) dataset includes a raster and vector representation of 1-km cells defining a uniform grid that encompasses the continental United States. The value of each cell of the raster dataset corresponds to the 1-km cell number defined as 'cellnum' in the attributes of the vector data. The NHG consists of 4,000 rows and 4,980 columns, numbered from the top left corner of the grid, to correspond to the traditional row and column numbering system of the MODFLOW groundwater-flow simulation code (Hughes and others, 2017; Langevin and others, 2017). The Albers projection was chosen for the NHG because of the capability to best preserve area, which is crucial in the computation of volume for water-resource investigations (Kuniansky, 2016). The upper left coordinate of the NHG in the Albers projection, in units of meters is -2553045.0, 3907285.0 with a rotation of zero degrees.

Get Data and Metadata
Author(s) Brian R Clark orcid, Paul M Barlow orcid, Steven M Peterson orcid, Joseph D Hughes orcid, Howard W Reeves orcid, Roland Viger orcid
Publication Date 2018
Beginning Date of Data 2017-12-13
Ending Date of Data 2017-12-13
Data Contact
Brian R Clark
DOI https://doi.org/10.5066/F7P84B24
Citation Clark, B.R., Barlow, P.M., Peterson, S.M., Hughes, J.D., Reeves, H.W., and Viger, R., 2018, National-Scale Grid to Support Regional Groundwater Availability Studies and a National Hydrogeologic Database: U.S. Geological Survey data release, https://doi.org/10.5066/F7P84B24.
Metadata Contact
B.R Clark
Metadata Date 2020-08-26
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Access public
License http://www.usa.gov/publicdomain/label/1.0/
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Harvest Source: ScienceBase
Harvest Date: 2024-07-30T04:03:30.725Z